Basic wiring was included. I later attached a more detailed though basic wiring diagram. I did not give steps of building the box, painting, or how to be a nice person. If you have a specific question(s), please ask - nicely. If you just wanted to be not nice (see be nice policy), then you have succeeded, well done!

Simplistic reply: They are 4 ohm. 8 ohm might be easier on the amp and perhaps extend battery life (which is already amazing). But I have not suffered any ill effects using the 4 ohm. As for amp damage? This amp was designed to drive down to 2 ohm, so no real concerns there. Thanks for the compliment. I get a lot of "please build me one" requests.